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Anonymous Posted on Mar 09, 2010

Amp blows fuses

I have a Kenwood KAC-9103D 1800 watt amp. Everytime i turn the amp all the way up it blows the fuses. i hooked up a lanzar vibe 431 1200 watt amp samething fuses blew. All the wires were checked everything there is good. i hooked the kenwood back up it was fine for about 20 mins. then the fuses blew again. any ideas on how to fix this

  • Anonymous Mar 09, 2010

    I have 4 gauge wiring for my power and ground. the ground is mounted to the frame. everytime i turn the volume up the fuses blow. they are 2 3o AMPS. I have a 60 amp under the hood. the speakers are wired 1 ohm. i checked all the wiring. no shorts

  • Anonymous Mar 09, 2010

    the speakers are 500 rms each 1200 watt peak. the amp is 900 rms x1 at 1ohm. 1800 watt peak power

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Rick Rife

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  • Posted on Mar 09, 2010
Rick Rife
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Fuses blow to save the amp. Are your speakers too big for the amp? If this amp is rated RMS @ 16olms it will only power around 600 to 800 @ 8olm and less as you drop down. better to have too much amp then too little so if you are trying to push 1000 watts per speaker @ 8 olms you are way under powered. Also check to make sure your wires are correct inside your speaker cables

  • Rick Rife
    Rick Rife Mar 09, 2010

    how many watts are you trying to push. 2500 watt speakers need 2500 watts @ same olms. It is a miss conception that you only push what you need. If you don't have enough amp to handle the load it will either burn the amp up or voice coils in speakers. Or in your case blow the curcuit to keep from doing the later

  • Rick Rife
    Rick Rife Mar 09, 2010

    16 olm or 8 olm load speakers

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Chris Merrill

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  • Posted on Mar 09, 2010
Chris Merrill
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Are you using the correct fuse? if so,
more then likely, you don't have a good ground. Try grounding to something else that has more direct connection to your frame. If that doesnt work, try getting larger power cables.
I had the same problem with my 2500w xplodes all I had to do was get a thicker cable for the ground and battery connection. What was happening, was it was needing more power then the wire and fuse could handle, so it would blow the fuse, since the higher you have it, the more power it needs to feed the watts.
I would try grounding it directly to the frame on a good part of the frame before spending another $70 on new power cables though.

  • Chris Merrill Mar 09, 2010

    Oldmanewtoys is very right, Just because you have a 2000w amp doesnt mean it can push or handle your 2 1000w speakers.


    Your amp will work on your speakers, but when you try to push them, even if your speakers are to much for your amp to push them. If your olm doesnt match, your amp may be pushing to much power to them, or trying to compensate for the amount of power needed to push them. either way, its not good, and can fry something you don't want fried.

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What size amp is the kenwood KAC-9103d amp

im not sure what you mean by what size amp....whether you mean physical size or wattage (power) so I have provided a website link for all the specifications that you require..........

http://my.kenwood.com/Car_Entertainment/Power_Amplifiers/KAC-9103D

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The Radial SD competition series from Phoenix Gold are rated to handle up to 600 watts RMS. If you have the model RSdC124 with dual 4 ohm voice coils, it would be best to wire the voice coils in parallel for a 2 ohm load and connect the sub to one set of terminals on the amp. If your sub is the model RSdC122 with dual 2 ohm voice coils, you should wire the voice coils is series for a 4 ohm load and connect the sug to one set of terminals on the amp. Wiring the voice coils in parallel will result in a 1 ohm load. And, while the amp may be stable at 1 ohm, the sub will be seriously overpowered.

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If your subs are 4ohm SVC wired Parallel, resulting in a 2 ohm load, each sub will only see 1/2 of the rated power. (450W ea.)
Your gain (sensitivity) setting should be between 75% and 85% to max. You will be fine.
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